The man was described as 20-40 years old, white European, with brown receding hair and goatee beard.

He was wearing black smart leather shoes from Zara, jeans and a pink t-shirt with a Bench hooded top.

The earlier case of a man’s body goes back 32 years and also remains unsolved.

The man’s body was discovered on May 8, 1982 in the River Colne behind the sewage works at Deighton.

He is believed to have been in the water for several months. His three front upper teeth were on a denture plate.

Police conducted extensive inquiries for many months but were never able to put a name to the corpse.

Meanwhile the national picture for so called ‘John and Jane Does shows a staggering 536 unidentified bodies are being investigated by police forces, according to the Missing Persons Bureau.

The other cases in West Yorkshire include the skeletal remains of man found in November 2003 at High Moor Tree Plantation, Silsden.

And the further two date back to the 70s when male bodies was found in the River Aire, one in Leeds in 1974 and one in Knottingley in 1978.

The Missing Person’s Bureau, part of the National Crime Agency, launched its website last year which for the first time contains images and distinguishing features of about 500 unidentified bodies found across the country.

The bodies of four missing people have been identified as a result.

One of the matches followed a call from a man who thought an image on the website was that of his brother, who was last seen in 1994. Fingerprints proved it was a match.